发电机水氢氢冷却概念？
参考答案：
水氢氢冷却即定子线圈采用水内冷，转子线圈采用氢内冷，静子铁芯及其它构件采用氢气表面冷却。
The chief manager has decided to put _____ he thinks is energetic, clever and capable to the position of the leadership of the company.
A．whatever
B．whoever
C．whichever
D．whomever
货运的经济活动只是一种服务行为，不直接产生新的社会财富。
